voonhous commented on code in PR #19295:
URL: https://github.com/apache/hudi/pull/19295#discussion_r3681684406


##########
hudi-trino/src/test/java/io/trino/plugin/hudi/testing/DmsPayloadHudiTablesInitializer.java:
##########
@@ -0,0 +1,132 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package io.trino.plugin.hudi.testing;
+
+import com.google.common.collect.ImmutableList;
+import io.trino.metastore.Column;
+import org.apache.avro.Schema;
+import org.apache.avro.generic.GenericData;
+import org.apache.avro.generic.GenericRecord;
+import org.apache.hudi.client.HoodieJavaWriteClient;
+import org.apache.hudi.client.WriteStatus;
+import org.apache.hudi.common.model.AWSDmsAvroPayload;
+import org.apache.hudi.common.model.HoodieAvroPayload;
+import org.apache.hudi.common.model.HoodieRecord;
+import org.apache.hudi.common.table.HoodieTableMetaClient;
+import org.apache.hudi.config.HoodieWriteConfig;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+import java.util.Optional;
+
+import static io.trino.metastore.HiveType.HIVE_LONG;
+import static io.trino.metastore.HiveType.HIVE_STRING;
+
+/**
+ * Creates a non-partitioned Merge-On-Read table whose merge semantics come 
from the
+ * {@link AWSDmsAvroPayload} class persisted in the table config (issue 
apache/hudi#18898). ONLY the payload
+ * class is set (no merge mode / strategy id), so table creation translates it 
exactly as a real writer
+ * would: at the current table version this "deprecated" payload becomes 
COMMIT_TIME_ORDERING plus PREFIXED
+ * delete-key props ({@code 
hoodie.record.merge.property.hoodie.payload.delete.field=Op}, marker {@code D}).
+ * <p>
+ * A base commit is followed by a log record with {@code Op='D'}, which 
deletes the row at merge time via
+ * {@code DeleteContext}, with the payload never executing at read.
+ * <p>
+ * Records are wrapped in {@link HoodieAvroPayload} (a pass-through that is 
NOT a {@code BaseAvroPayload}),
+ * so rows a semantic payload would drop at write time land as DATA records 
and every merge decision happens
+ * at read time. See {@code TestHudiMorPayloadSemantics}.
+ */
+public class DmsPayloadHudiTablesInitializer
+        extends AbstractMergerHudiTablesInitializer
+{
+    public static final String TABLE_NAME = "mor_dms";
+    public static final String RT_TABLE_NAME = TABLE_NAME + "_rt";
+
+    private static final String OP_FIELD = "Op";
+
+    public DmsPayloadHudiTablesInitializer()
+    {
+        super(TABLE_NAME);
+    }
+
+    @Override
+    protected List<Column> dataColumns()
+    {
+        return ImmutableList.of(
+                new Column(RECORD_KEY_FIELD, HIVE_STRING, Optional.empty(), 
Map.of()),
+                new Column("name", HIVE_STRING, Optional.empty(), Map.of()),
+                new Column("value", HIVE_LONG, Optional.empty(), Map.of()),
+                // The Avro/parquet field is 'Op' (AWSDms hardcodes that 
casing), but a real Hive
+                // metastore lowercases column names on DDL -- exactly the 
case mismatch the connector's
+                // merge-column matching must bridge
+                new Column(OP_FIELD.toLowerCase(Locale.ROOT), HIVE_STRING, 
Optional.empty(), Map.of()),
+                new Column(ORDERING_FIELD, HIVE_LONG, Optional.empty(), 
Map.of()));
+    }
+
+    @Override
+    protected Schema avroSchema()
+    {
+        List<Schema.Field> fields = ImmutableList.of(
+                new Schema.Field(RECORD_KEY_FIELD, 
Schema.create(Schema.Type.STRING)),
+                new Schema.Field("name", Schema.create(Schema.Type.STRING)),
+                new Schema.Field("value", Schema.create(Schema.Type.LONG)),
+                new Schema.Field(OP_FIELD, Schema.create(Schema.Type.STRING)),
+                new Schema.Field(ORDERING_FIELD, 
Schema.create(Schema.Type.LONG)));
+        return Schema.createRecord(TABLE_NAME, null, null, false, new 
ArrayList<>(fields));
+    }
+
+    @Override
+    protected void configureTableConfig(HoodieTableMetaClient.TableBuilder 
tableBuilder)
+    {
+        tableBuilder.setPayloadClassName(AWSDmsAvroPayload.class.getName());
+    }
+
+    @Override
+    protected void configureWriteConfig(HoodieWriteConfig.Builder 
writeConfigBuilder)
+    {
+        writeConfigBuilder.withWritePayLoad(AWSDmsAvroPayload.class.getName());
+    }
+
+    @Override
+    protected void 
writeInitialCommits(HoodieJavaWriteClient<HoodieAvroPayload> client)
+    {
+        Schema schema = avroSchema();
+        String firstCommit = client.startCommit();
+        List<WriteStatus> firstStatuses = client.bulkInsert(ImmutableList.of(
+                record(schema, "k1", "k1_base", 10L, "I", 100L),
+                record(schema, "k2", "k2_base", 20L, "I", 100L)), firstCommit);
+        client.commit(firstCommit, firstStatuses);
+
+        // Log record with Op='D'. The pass-through HoodieAvroPayload writes 
it as a DATA record;
+        // DeleteContext (delete key Op, marker D from the translated table 
config) deletes the row
+        // at merge time.
+        String secondCommit = client.startCommit();
+        List<WriteStatus> secondStatuses = client.upsert(ImmutableList.of(
+                record(schema, "k2", "k2_deleted", 22L, "D", 200L)), 
secondCommit);

Review Comment:
   Added: the second commit now also carries a `k1` log record with the 
non-marker `Op='U'`, and the tests expect that update to **apply**. A marker 
comparison that fires on any non-null `Op` would wrongly delete `k1` and fail 
the suite.



##########
hudi-trino/src/test/java/io/trino/plugin/hudi/testing/EventTimeDeletesHudiTablesInitializer.java:
##########
@@ -0,0 +1,156 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package io.trino.plugin.hudi.testing;
+
+import com.google.common.collect.ImmutableList;
+import io.trino.metastore.Column;
+import org.apache.avro.JsonProperties;
+import org.apache.avro.Schema;
+import org.apache.avro.generic.GenericData;
+import org.apache.avro.generic.GenericRecord;
+import org.apache.hudi.client.HoodieJavaWriteClient;
+import org.apache.hudi.client.WriteStatus;
+import org.apache.hudi.common.config.RecordMergeMode;
+import org.apache.hudi.common.model.HoodieAvroPayload;
+import org.apache.hudi.common.model.HoodieRecord;
+import org.apache.hudi.common.table.HoodieTableMetaClient;
+import org.apache.hudi.config.HoodieWriteConfig;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+
+import static io.trino.metastore.HiveType.HIVE_BOOLEAN;
+import static io.trino.metastore.HiveType.HIVE_LONG;
+import static io.trino.metastore.HiveType.HIVE_STRING;
+import static 
org.apache.hudi.common.model.HoodieRecord.HOODIE_IS_DELETED_FIELD;
+
+/**
+ * Creates a non-partitioned Merge-On-Read table in {@link 
RecordMergeMode#EVENT_TIME_ORDERING} that
+ * exercises the read-side merge-mode dispatch with deletes (issue 
apache/hudi#18898). ONLY a record merge
+ * mode is set (no payload class), so table creation persists the mode as-is, 
which is exactly the dispatch
+ * input {@code HudiTrinoReaderContext.getRecordMerger} switches on.
+ * <p>
+ * A base commit is followed by a log commit carrying an update, a soft delete
+ * ({@code _hoodie_is_deleted=true}), an OBSOLETE soft delete and an OBSOLETE 
update (both with an ordering
+ * value LOWER than the base row's, so event-time merging must keep the base 
row), and then a hard-delete
+ * commit ({@code writeClient.delete}) that produces a native delete log file 
read back through the
+ * connector's {@code getFileRecordIterator}.
+ * <p>
+ * Records are wrapped in {@link HoodieAvroPayload}, which implements {@code 
HoodieRecordPayload} directly
+ * (NOT {@code BaseAvroPayload}), so rows with {@code _hoodie_is_deleted=true} 
are written as DATA records
+ * and delete semantics are evaluated at READ time. See {@code 
TestHudiMorMergeModeSemantics}.
+ */
+public class EventTimeDeletesHudiTablesInitializer
+        extends AbstractMergerHudiTablesInitializer
+{
+    public static final String TABLE_NAME = "mor_deletes";

Review Comment:
   Flipped all five to trail with `_mor`: `deletes_mor`, `commit_time_mor`, 
`dms_mor`, `overwrite_non_defaults_mor`, `summing_mor`.



##########
hudi-trino/src/test/java/io/trino/plugin/hudi/testing/SummingPayloadHudiTablesInitializer.java:
##########
@@ -0,0 +1,116 @@
+/*
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package io.trino.plugin.hudi.testing;
+
+import com.google.common.collect.ImmutableList;
+import io.trino.metastore.Column;
+import org.apache.avro.Schema;
+import org.apache.avro.generic.GenericData;
+import org.apache.avro.generic.GenericRecord;
+import org.apache.hudi.client.HoodieJavaWriteClient;
+import org.apache.hudi.client.WriteStatus;
+import org.apache.hudi.common.model.HoodieAvroPayload;
+import org.apache.hudi.common.model.HoodieRecord;
+import org.apache.hudi.common.table.HoodieTableMetaClient;
+import org.apache.hudi.config.HoodieWriteConfig;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+
+import static io.trino.metastore.HiveType.HIVE_LONG;
+import static io.trino.metastore.HiveType.HIVE_STRING;
+
+/**
+ * Creates a non-partitioned Merge-On-Read table whose merge semantics come 
from the {@link SummingTestPayload}
+ * class persisted in the table config (issue apache/hudi#18898). ONLY the 
payload class is set (no merge mode
+ * / strategy id), so table creation translates it exactly as a real writer 
would: this user-defined payload is
+ * NOT in the deprecation set, so it is persisted as RECORD_MERGE_MODE=CUSTOM 
with the payload-based merge
+ * strategy id. Reads resolve {@code HoodieAvroRecordMerger} (no {@code 
hudi.record-merger-impls} needed) and
+ * run the payload's {@code combineAndGetUpdateValue}, observable as SUMMED 
values.
+ * <p>
+ * Records are wrapped in {@link HoodieAvroPayload} (a pass-through that is 
NOT a {@code BaseAvroPayload}), so
+ * every merge decision happens at read time from the table config. See {@code 
TestHudiMorPayloadSemantics}.
+ */
+public class SummingPayloadHudiTablesInitializer
+        extends AbstractMergerHudiTablesInitializer
+{
+    public static final String TABLE_NAME = "mor_summing";
+    public static final String RT_TABLE_NAME = TABLE_NAME + "_rt";
+
+    private static final String SUM_FIELD = SummingTestPayload.SUM_COLUMN;
+
+    public SummingPayloadHudiTablesInitializer()
+    {
+        super(TABLE_NAME);
+    }
+
+    @Override
+    protected List<Column> dataColumns()
+    {
+        return ImmutableList.of(
+                new Column(RECORD_KEY_FIELD, HIVE_STRING, Optional.empty(), 
Map.of()),
+                new Column(SUM_FIELD, HIVE_LONG, Optional.empty(), Map.of()),
+                new Column(ORDERING_FIELD, HIVE_LONG, Optional.empty(), 
Map.of()));
+    }
+
+    @Override
+    protected Schema avroSchema()
+    {
+        List<Schema.Field> fields = ImmutableList.of(
+                new Schema.Field(RECORD_KEY_FIELD, 
Schema.create(Schema.Type.STRING)),
+                new Schema.Field(SUM_FIELD, Schema.create(Schema.Type.LONG)),
+                new Schema.Field(ORDERING_FIELD, 
Schema.create(Schema.Type.LONG)));
+        return Schema.createRecord(TABLE_NAME, null, null, false, new 
ArrayList<>(fields));
+    }
+
+    @Override
+    protected void configureTableConfig(HoodieTableMetaClient.TableBuilder 
tableBuilder)
+    {
+        tableBuilder.setPayloadClassName(SummingTestPayload.class.getName());
+    }
+
+    @Override
+    protected void configureWriteConfig(HoodieWriteConfig.Builder 
writeConfigBuilder)
+    {
+        
writeConfigBuilder.withWritePayLoad(SummingTestPayload.class.getName());
+    }
+
+    @Override
+    protected void 
writeInitialCommits(HoodieJavaWriteClient<HoodieAvroPayload> client)
+    {
+        Schema schema = avroSchema();
+        String firstCommit = client.startCommit();
+        List<WriteStatus> firstStatuses = client.bulkInsert(ImmutableList.of(
+                record(schema, "k1", 10L, 100L)), firstCommit);
+        client.commit(firstCommit, firstStatuses);
+
+        // The payload's combineAndGetUpdateValue SUMS stored and incoming 
values: 10 + 99 = 109 --
+        // a result neither overwrite (99) nor base-only (10) can produce.
+        String secondCommit = client.startCommit();
+        List<WriteStatus> secondStatuses = client.upsert(ImmutableList.of(
+                record(schema, "k1", 99L, 200L)), secondCommit);
+        client.commit(secondCommit, secondStatuses);

Review Comment:
   Took it in scope: the summing fixture now writes a second key and 
hard-deletes it in a final commit, pinned by 
`testSummingPayloadHardDeleteRemovesRowOnSnapshotRead`. The native delete 
record routes through the payload-based CUSTOM arm (`HoodieAvroRecordMerger` 
with an empty payload) and wins against the base row.



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